mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-08 13:50:20 +00:00
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
#include "prx/libc/include/Api.hpp"
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#include <algorithm>
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#include <array>
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <string>
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#include <vector>
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static void Require(bool condition) {
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if (!condition) {
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std::fputs("GuestStrncpyProtected check failed\n", stderr);
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std::abort();
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}
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}
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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class Buffer {
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unsigned char* allocation;
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std::size_t page;
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public:
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Buffer() {
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#ifdef _WIN32
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SYSTEM_INFO info{};
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GetSystemInfo(&info);
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page = info.dwPageSize;
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allocation = static_cast<unsigned char*>(VirtualAlloc(nullptr, page * 3, MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS));
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Require(allocation != nullptr);
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DWORD previous;
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Require(VirtualProtect(allocation + page, page, PAGE_READWRITE, &previous) != 0);
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#else
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const long size = sysconf(_SC_PAGESIZE);
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Require(size > 0);
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page = static_cast<std::size_t>(size);
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allocation = static_cast<unsigned char*>(mmap(nullptr, page * 3, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
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Require(allocation != MAP_FAILED);
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Require(mprotect(allocation + page, page, PROT_READ | PROT_WRITE) == 0);
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#endif
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std::memset(allocation + page, 0xa5, page);
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}
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~Buffer() {
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#ifdef _WIN32
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Require(VirtualFree(allocation, 0, MEM_RELEASE) != 0);
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#else
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Require(munmap(allocation, page * 3) == 0);
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#endif
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}
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Buffer(const Buffer&) = delete;
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Buffer& operator=(const Buffer&) = delete;
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unsigned char* At(std::size_t count) {
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Require(count <= page - 32);
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return allocation + page * 2 - (std::max)(count, std::size_t{1});
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}
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};
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int main() {
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Buffer input, output;
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for (std::size_t count = 0; count <= 192; ++count) {
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for (std::size_t length : {std::size_t{0}, count / 2, count, count + 1}) {
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const std::string original(length, static_cast<char>(0x81));
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auto* source = reinterpret_cast<char*>(input.At(length + 1));
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auto* destination = reinterpret_cast<char*>(output.At(count));
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std::memcpy(source, original.c_str(), length + 1);
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std::memset(destination - 16, 0xa5, (std::max)(count, std::size_t{1}) + 16);
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Require(strncpy_nid_postfix(destination, source, count) == destination);
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for (std::size_t i = 0; i < count; ++i) Require(destination[i] == (i < length ? static_cast<char>(0x81) : '\0'));
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if (count == 0) Require(static_cast<unsigned char>(*destination) == 0xa5);
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for (int i = 1; i <= 16; ++i) Require(static_cast<unsigned char>(destination[-i]) == 0xa5);
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Require(std::memcmp(source, original.c_str(), length + 1) == 0);
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}
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}
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}
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